Analysis on the effect of high temperature damage on cotton boll abscission

doi:10.14088/j.cnki.issn0439-8114.2022.21.003

Abstract

Abstract: Through the high temperature simulation test in the artificial climate chamber, the effects of high temperature heat damage on the abscission of cotton（Gossypium spp.） leaves and buds and bolls were studied. The results showed that the leaves, buds and young bolls of cotton showed abnormal abscission after high temperature stress with different intensities and different durations. The longer the duration of high temperature and the higher the temperature, the higher the abscission rate of buds and bolls and the abscission rate of leaves （defoliation rate）. Compared with the control, under the high temperature of 35 ℃, the defoliation rate increased by 19.8,28.0 and 50.7 percentage points at 3,6 and 9 days after treatment, and the bud and boll shedding rate increased by 17.7,19.8 and 33.7 percentage points, respectively. At 38 ℃, the defoliation rate increased by 24.7,32.4 and 52.3 percentage points at 3,6 and 9 days after treatment, and the bud and boll shedding rate increased by 23.4,26.9 and 37.5 percentage points, respectively. Through the analysis of the climate diagnosis method of the highest temperature change rule in Shihezi reclamation area from 1964 to 2019, it was concluded that the high temperature of ≥ 35 ℃ in Shihezi reclamation area mainly occurred from June to August, the average number of high temperature days was 13.2 d, and the probability of high temperature for 3 consecutive days was 76.3%. It showed that the probability of high temperature heat damage in Shihezi reclamation area was high, which was one of the main meteorological disasters that restricted the high yield and high quality of cotton. Prevention should be strengthened in cotton production.

Key words: cotton, high temperature damage, boll abscission

CLC Number:

S562

XIANG Dao, YANG Ming-feng, ZHANG Ling, ZHANG Ming, WANG Xue-jiao. Analysis on the effect of high temperature damage on cotton boll abscission[J]. HUBEI AGRICULTURAL SCIENCES, 2022, 61(21): 15-19.

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